Cuphead

Cuphead stands as the most visually audacious indie game ever released, with Studio MDHR hand-drawing every frame in the style of 1930s Fleischer cartoons—a labor that consumed seven years and involved over 150,000 frames of animation. Its boss-rush design and live-recorded jazz soundtrack create a distinctive challenge that has sold over 6 million copies. That painstaking process resulted in a game where each boss encounter features unique, hand-animated transformations, delivering a density of visual craft that has no equal in the genre.